Leiva Mas, J., I. Rodríguez Rico, P. Martínez Nodal, and C. Quintana Perez. “Methodology for Calculating the Ecological Footprint in Industries”. Centro Azúcar Journal, vol. 37, no. 2, Apr. 2010, http://centroazucar.uclv.edu.cu/index.php/centro_azucar/article/view/413.